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/* ----------------------------------------- *
        Lazy List Implementation
* ----------------------------------------- */

// Haskell-like infinite List, implemented with es6 generators

// Lazyness lets you do crazy stuff like
List.range(0, Infinity)
  .drop(1000)
  .map(n => -n)

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const waterVolume = a => {
  const max = Math.max(...a)
  let sum = 0
  for (let i = max; i >0; i--) {
    let started = false, tmpSum = 0
    for (let j = 0; j < a.length; j++) {
      if (a[j] >= i) {
        if (!started) {
          started = true
        } else {

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const encode = msg => {
  const abc = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
  const morsecode =[
    '.-', '-...', '-.-.', '-..', '.', '..-.', '--.', '....',
    '..', '.---', '-.-', '.-..', '--', '-.', '---', '.--.',
    '--.-', '.-.', '...', '-', '..-', '...-', '.--', '-..-',
    '-.--', '--..'
  ]
  const words = msg.toUpperCase().split(' ')
  

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// Function Composition
const identity = x => x
const compose = (f, g) => x => f(g(x))
const composer = fnArr => fnArr.reduce(compose, identity)

// Map implemented in terms of reduce
const mmap = fn => reducer => (acc, val) => reducer(acc, fn(val))

// Filter implemented in terms of reduce
const mfilter = fn => reducer => (acc, val) => fn(val) ? reducer(acc, val) : acc

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const findAnagramIndexes = (w1, w2) => {
  let result = [];
  let control = [];
  
  for(let i = 0; i < w1.length; i++){
    if(control[i] === undefined) control[i] = w2.split('');
    for(let j = 0; j < control.length; j++) {
      if(control[j] === null) continue;
      if(Array.isArray(control[j]) && control[j].length === 0) continue;
      let indexOfLetter = control[j].indexOf(w1[i]);

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const neighbours = (pos, transf) => {
  const x = pos[0]
  const y = pos[1]
  return [[x-1, y-1],[x, y-1],[x+1, y-1],[x-1, y],[x,y],[x+1, y],[x-1, y+1],[x, y+1],[x+1, y+1]].map(transf)
}

const maxSumRect = (rows, cols, nums) => {
  const revVirtMatrix = pos => [parseInt(pos / cols), pos % cols]
  const virtualMatrix = pos => (pos[0] * cols + pos[1])
  return nums.reduce((max, val, idx) => {

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# app deps
sudo yum install git

# erlang deps
sudo yum groupinstall "Development Tools"
sudo yum install ncurses-devel

# erlang
wget http://www.erlang.org/download/otp_src_18.1.tar.gz
tar -zxvf otp_src_18.1.tar.gz

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// from http://forwardjs.com/university/a-million-ways-to-fold-in-js

'use strict'

const first = (xs) => xs[0]
const rest = (xs) => xs.slice(1)
const concat = (xs1, xs2) => xs1.concat(xs2)

// recursion
const sum = (xs) => {

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import Data.List

data Peg = Red | Green | Blue | Yellow | Orange | Purple deriving (Show, Eq, Ord)
type Code = [Peg]
data Move = Move Code Int Int deriving (Show, Eq)

colors :: [Peg]
colors = [Red, Green, Blue, Yellow, Orange, Purple]

exactMatches :: (Eq a) => [a] -> [a] -> Int

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let edificios = [
  [2, 9, 10], 
  [2, 4, 12],
  [3, 7, 15], 
  [5, 12, 12], 
  [15, 20, 10], 
  [19, 24, 8] 
]

function skyline(buildings){